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ICS7152A
Spread Spectrum Clock Generator
Description
The ICS7152A-02 and -11 are clock generators for EMI (Electromagnetic Interference) reduction (see below for frequency ranges and multiplier ratios). Spectral peaks are attenuated by modulating the system clock frequency. Down or center spread profiles are selectable. Down spread will not exceed the maximum frequency of an unspread clock, and center spread does not change the average operating frequency of the system ICS offers many other clocks for computers and computer peripherals. Consult ICS when you need to remove crystals and oscillators from your board.
Features
* * * * * * * * * *
Operating voltage of 3.3 V 0.3 V Packaged in 8-pin SOIC Input frequency range of 16.6 to 134.0 MHz Output frequency range of 16.6 to 134.0 MHz Provides a spread spectrum clock output (0.5%, 1.5% center spread; -1.0%, -3.0% down spread) Low cycle-to-cycle jitter - less than 100 ps Advanced, low-power CMOS process Industrial and commercial temperature ranges Available in Pb (lead) free package Pin compatible with Fujitsu MB88152-102 and -111
Block Diagram
VDD
SEL FREQ XENS
XIN
PLL Clock Synthesis and Spread Spectrum Circuitry
Clock Buffer/ Crystal Ocsillator
CKOUT
XOUT External caps required with crystal for accurate tuning of the clock
GND
Product Lineup
Product Input Frequency Range Modulation Type Modulation Enable Pin
ICS7152AM-02, ICS7152AMI-02 ICS7152AM-11, ICS7152AMI-11
40.0 MHz to 134.0 MHz 16.6 MHz to 67.0 MHz
Down spread Center spread
Yes
MDS 7152A A Integrated Circuit Systems, Inc.
1
525 Race Street, San Jose, CA 95126
Revision 102005 tel (408) 297-1201
www.icst.com
ICS7152A Spread Spectrum Clock Generator
Pin Assignment
XIN XOUT GND SEL 1 2 3 4 8 7 6 5 8 pin (150 mil) SOIC XENS FREQ VDD CKOUT
Spread Direction and Percentage Select Table
SEL Pin 4 Spread Direction Spread Percentage (%) Part Number
0
Center Down
0.5 -1.0 1.5 -3.0
ICS7152AM-11 ICS7152AM-02 ICS7152AM-11 ICS7152AM-02
1
Center Down
Modulation Enable Select Table
XENS Pin 8 0 1 Modulation Modulation No modulation
Frequency Select Table
FREQ Pin 7 Frequency
0
16.6 to 40 MHz 40 to 80 MHz
ICS7152AM-11 ICS7152AM-02 ICS7152AM-11 ICS7152AM-02
1
33 to 67 MHz 66 to 134 MHz
Pin Descriptions
Pin Number Pin Name Pin Type Pin Description
1 2 3 4 5 6 7 8
XIN XOUT GND SEL CKOUT VDD FREQ XENS
Input Output Power Input Output Power Input Output
Crystal/clock input pin. Crystal. Connect to ground. Spread modulation select. Spread modulation select. Connect to +3.3 V. Frequency select. Modulation enable select.
MDS 7152A A Integrated Circuit Systems, Inc.
2
525 Race Street, San Jose, CA 95126
Revision 102005 tel (408) 297-1201
www.icst.com
ICS7152A Spread Spectrum Clock Generator
External Components
The ICS7152A requires a minimum number of external components for proper operation.
away from the ICS7152A. This includes signal traces just underneath the device, or on layers adjacent to the ground plane layer used by the device.
Decoupling Capacitor
A decoupling capacitor of 0.01F must be connected between GND and VDD on pins 3 and 6, as close to these pins as possible. For optimum device performance, the decoupling capacitor should be mounted on the component side of the PCB. Avoid the use of vias in the decoupling circuit.
Crystal Information
The crystal used should be a fundamental mode, parallel resonant. Crystal capacitors should be connected from pins X1 to ground and X2 to ground to optimize the initial accuracy. The value of these capacitors is given by the following equation: Crystal caps (pF) = (CL - 6) x 2 In the equation, CL is the crystal load capacitance. So, for a crystal with a 16 pF load capacitance, two 20 pF [(16-6) x 2] capacitors should be used.
Series Termination Resistor
Series termination should be used on the clock output. To series terminate a 50 trace (a commonly used trace impedance) place a 27 resistor in series with the clock line, as close to the clock output pin as possible. The nominal impedance of the clock output is 25.
Spread Spectrum Profile
The ICS7152A low EMI clock generator uses a triangular frequency modulation profile for optimal down stream tracking of zero delay buffers and other PLL devices. The frequency modulation amplitude is constant with variations of the input frequency.
PCB Layout Recommendations
For optimum device performance and lowest output phase noise, the following guidelines should be observed. 1) The 0.01F decoupling capacitor should be mounted on the component side of the board as close to the VDD pin as possible. No vias should be used between the decoupling capacitor and VDD pin. The PCB trace to VDD pin should be kept as short as possible, as should the PCB trace to the ground via. 2) To minimize EMI, the 27 series termination resistor (if needed) should be placed close to the clock output. 3) An optimum layout is one with all components on the same side of the board, minimizing vias through other signal layers. Other signal traces should be routed
Modulation Rate
Frequency
Time
MDS 7152A A Integrated Circuit Systems, Inc.
3
525 Race Street, San Jose, CA 95126
Revision 102005 tel (408) 297-1201
www.icst.com
ICS7152A Spread Spectrum Clock Generator
Absolute Maximum Ratings
Stresses above the ratings listed below can cause permanent damage to the ICS7152A. These ratings, which are standard values for ICS commercially rated parts, are stress ratings only. Functional operation of the device at these or any other conditions above those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods can affect product reliability. Electrical parameters are guaranteed only over the recommended operating temperature range.
Item
Supply Voltage, VDD All Inputs and Outputs (referenced to GND) Ambient Operating Temperature Storage Temperature Junction Temperature Soldering Temperature Overshoot (VIOVER) Undershoot (VIUNDER) -0.5 to 4.0 V
Rating
-0.5 V to VDD+0.5 V -40 to +85C -55 to +125C -40 to +125C 260C VDD + 1.0 V (tOVER < 50 ns) max GND - 1.0 V (tUNDER < 50 ns) min
Overshoot/Undershoot
tUNDER < 50 ns VIOVER < VDD + 1.0 V VDD GND VIUNDER < GND - 1.0 V
Input pin
tOVER < 50 ns
Recommended Operation Conditions
Parameter
Ambient Operating Temperature Power Supply Voltage (measured in respect to GND)
Min.
-40 +3.0
Typ.
3.3
Max.
+85 3.6
Units
C V
MDS 7152A A Integrated Circuit Systems, Inc.
4
525 Race Street, San Jose, CA 95126
Revision 102005 tel (408) 297-1201
www.icst.com
ICS7152A Spread Spectrum Clock Generator
DC Electrical Characteristics
Unless stated otherwise, VDD = 3.3 V 0.3 V, Ambient Temperature -40 to +85C
Parameter
Operating Voltage Supply Current
Symbol
VDD IDD
Conditions
No load, at 3.3 V, output = 24 MHz SEL, FREQ, XENS XIN, Input slew rate 3 V/ns, 16.6 to 100 MHz XIN, Input slew rate 3 V/ns, 100 to 134 MHz SEL, FREQ, XENS XIN, Input slew rate 3 V/ns, 16.6 to 100 MHz XIN, Input slew rate 3 V/ns, 100 to 134 MHz
Min.
3.0
Typ.
3.3 10
Max.
3.6 14 VDD + 0.3 VDD + 0.3
Units
V mA V V
VDD x 0.8 VDD x 0.8
Input High Voltage
VIH
VDD x 0.9
VDD + 0.3
V
GND GND
VDD x 0.20 VDD x 0.20
V V
Input Low Voltage
VIL
GND
VDD x 0.10
V
Output High Voltage Output Low Voltage Input Capacitance
VOH VOL CIN
CKOUT, IOH = -4 mA CKOUT, IOL = 4 mA XIN, SEL, XENS CKOUT, 16.6 to 67 MHz
VDD - 0.5 GND
VDD 0.4 16 15 10 7 25
V V pF pF pF pF
Load Capacitance
CL
CKOUT, 67 to 100 MHz CKOUT, 100 to 134 MHz
Output Impedance
ZO
CKOUT, 16.6 to 134 MHz
MDS 7152A A Integrated Circuit Systems, Inc.
5
525 Race Street, San Jose, CA 95126
Revision 102005 tel (408) 297-1201
www.icst.com
ICS7152A Spread Spectrum Clock Generator
AC Electrical Characteristics
Unless stated otherwise, VDD = 3.3 V 0.3 V, Ambient Temperature -40 to +85 C
Parameter
Oscillation Frequency
Symbol
fX
Conditions
XIN, XOUT, Fundamental oscillation XIN, XOUT, 3rd over tone, note 1
Min.
16.6
Typ.
Max.
40
Units
MHz
40 16.6 40 16.6 40 40 45 40 0.5 TBD TBD 2 33 50 50
48 67 134 67 134 60 55 60 3.0 100 5
MHz MHz MHz MHz MHz % % % V/ns ps ms kHz
Input Frequency Output Frequency Input Clock Duty Cycle Output Clock Duty Cycle Output Slew Rate Cycle to Cycle Jitter Lock Time Modulation Frequency
fIN fOUT tDCI tDCC
XIN, ICS7152A-11 XIN, ICS7152A-02 CKOUT, ICS7152A-11 CKOUT, ICS7152A-02 XIN, 16.6 to 100 MHz XIN, 100 to 134 MHz CKOUT, 1.5 V CKOUT, 0.4 to 2.4 V, load capacitance 15 pF
tJC tLK fMOD
No load, standard deviation CKOUT CKOUT=TBD
Note 1: Contact ICS Applications for more information.
MDS 7152A A Integrated Circuit Systems, Inc.
6
525 Race Street, San Jose, CA 95126
Revision 102005 tel (408) 297-1201
www.icst.com
ICS7152A Spread Spectrum Clock Generator
Input Frequency (fIN = 1/tIN)
tIN 0.8 VDD CKIN
Output Slew Rate
2.4 V CKOUT tr SR = (2.4 - 0.4) /tr, SR = (2.4 - 0.4) /tf tf 0.4 V
Thermal Characteristics
Parameter
Thermal Resistance Junction to Ambient
Symbol
JA JA JA JC
Conditions
Still air 1 m/s air flow 3 m/s air flow
Min.
Typ.
150 140 120 40
Max. Units
C/W C/W C/W C/W
Thermal Resistance Junction to Case
MDS 7152A A Integrated Circuit Systems, Inc.
7
525 Race Street, San Jose, CA 95126
Revision 102005 tel (408) 297-1201
www.icst.com
ICS7152A Spread Spectrum Clock Generator
Package Outline and Package Dimensions (8-pin SOIC, 150 Mil. Body)
Package dimensions are kept current with JEDEC Publication No. 95
8
Millimeters Symbol Min Max
Inches* Min Max
E INDEX AREA
H
12 D
A A1 B C D E e H h L
1.35 1.75 0.10 0.25 0.33 0.51 0.19 0.25 4.80 5.00 3.80 4.00 1.27 BASIC 5.80 6.20 0.25 0.50 0.40 1.27 0 8
.0532 .0688 .0040 .0098 .013 .020 .0075 .0098 .1890 .1968 .1497 .1574 0.050 BASIC .2284 .2440 .010 .020 .016 .050 0 8
*For reference only. Controlling dimensions in mm.
A A1 h x 45 C
-Ce
B SEATING PLANE L
.10 (.004)
C
MDS 7152A A Integrated Circuit Systems, Inc.
8
525 Race Street, San Jose, CA 95126
Revision 102005 tel (408) 297-1201
www.icst.com
ICS7152A
Spread Spectrum Clock Generator
Ordering Information
Part / Order Number
ICS7152AM-02 ICS7152AM-02T ICS7152AM-02LF ICS7152AM-02LFT ICS7152AMI-02 ICS7152AMI-02T ICS7152AMI-02LF ICS7152AMI-02LFT ICS7152AM-11 ICS7152AM-11T ICS7152AM-11LF ICS7152AM-11LFT ICS7152AMI-11 ICS7152AMI-11T ICS7152AMI-11LF ICS7152AMI-11LFT
Marking
7152AM02 7152AM02 152AM02L 152AM02L 152AMI02 152AMI02 52AMI02L 52AMI02L 7152AM11 7152AM11 152AM11L 152AM11L 152AMI11 152AMI11 52AMI11L 52AMI11L
Shipping Packaging
Tubes Tape and Reel Tubes Tape and Reel Tubes Tape and Reel Tubes Tape and Reel Tubes Tape and Reel Tubes Tape and Reel Tubes Tape and Reel Tubes Tape and Reel
Package
8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC
Temperature
0 to +70 C 0 to +70 C 0 to +70 C 0 to +70 C -40 to +85 C -40 to +85 C -40 to +85 C -40 to +85 C 0 to +70 C 0 to +70 C 0 to +70 C 0 to +70 C -40 to +85 C -40 to +85 C -40 to +85 C -40 to +85 C
Parts that are ordered with a "LF" suffix to the part number are the Pb-Free configuration and are RoHS compliant. While the information presented herein has been checked for both accuracy and reliability, Integrated Circuit Systems (ICS) assumes no responsibility for either its use or for the infringement of any patents or other rights of third parties, which would result from its use. No other circuits, patents, or licenses are implied. This product is intended for use in normal commercial applications. Any other applications such as those requiring extended temperature range, high reliability, or other extraordinary environmental requirements are not recommended without additional processing by ICS. ICS reserves the right to change any circuitry or specifications without notice. ICS does not authorize or warrant any ICS product for use in life support devices or critical medical instruments.
MDS 7152A A Integrated Circuit Systems, Inc.
9
525 Race Street, San Jose, CA 95126
Revision 102005 tel (408) 297-1201
www.icst.com
ICS7152A
Spread Spectrum Clock Generator
Revision History
Rev.
A
Originator
J. Sarma
Date
10/20/05
Description of Change
Rev A; new device/datasheet.
MDS 7152A A Integrated Circuit Systems, Inc.
10
525 Race Street, San Jose, CA 95126
Revision 102005 tel (408) 297-1201
www.icst.com

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